Ava DuVernay’s look at the criminal justice system may be the most shocking film of 2016. The documentary explores not only the current systemic problems that have led to mass incarceration, which disproportionately affects people or color, but also America’s history of racial justice and how the two are related.

The documentary also looks at how for-profit prison incentivizes the imprisonment of Americans, and why everyone should be outraged by the result.